WB 2.8.3 SP6 has not the log-system from the newer WB's.have you change the settings for PHP-Errors in WB-Option's -> Advanced optionsUse there a setting with E_ALL, but check some possible effect's also in the frontend (notices somewhere in the top etc)

these errors in your version are reported in the server-own error.logsearch in the server administration for infos about this